Over the weekend, more than a dozen ATM skimmers were found in Chicago and another one was discovered in Libertyville.

An ATM skimmer is a card reader placed over the ATM's real card slot. When you put your card in an ATM, the skimmer steals your card information. One way to make sure you don't become a victim of an ATM skimmer is to pull at protruding parts like the card reader and keypad. If you're able to remove part of the card reader or keypad, it's likely a skimmer.

Also, make sure to always cover the keypad when you're typing in your PIN. ATMs with skimmers usually have small cameras attached that record users' PINs.